/* 这种注释，编译后会出现在CSS文件上*/
#wrap {
  color: red;
}
.wrap {
  color: blue;
}
#wrap {
  background-color: red;
}
.box {
  border-style: solid;
}
body {
  background: url('../img/dog.png');
}
div {
  border: 1px solid red;
}
div {
  background-color: red;
}
#wrap {
  width: 9%;
}
.container {
  width: 200px;
  height: 100px;
  background-color: red;
}
.container .box {
  width: 100px;
  height: 100px;
  background-color: aliceblue;
}
.container .box .ul {
  width: 50px;
  height: 50px;
  background-color: skyblue;
}
#main .show {
  display: block;
}
.show {
  display: none;
}
